ceremonies in new york, pennsylvania, and virginia paid tribute to the 270 victims -- to the victims killed during the attack on 9/11. throughout the morning, as has now become the tradition the names of victims will be read, and four moments of silence will mark the times each plane hit and each plane fell. vice president joe biden is attending along with first responders. at the pentagon president obama delivers marks and participates in a wreath-laying ceremony at the memorial site. and where uneiletted flight -- united flight 93 crashed, first lady michelle obama and laura bush attend a ceremony. with each construction step forward, there remains a connection to the past. steel beams pulled from the ground zero level were permanently installed at the entrance to the national memorial and museum slated to be finished in 2012. >> it will be a memorial we will all be proud of and a memorial that will inspire people around the world, and always remind them never to forget. >> and tonight, what has ls also become a tradition, twin beams of light illuminating the night sky and symboliz